NO, NO and NO. Please see/find/borrow a copy of "Backbone of the Wehrmact The German K98kicon Rifle" The Author's Revised Edition, study pages 86 to 138. See pages 121 to 123. See the following "However, all the components were as yet still in-the-white (unblued) and unserialled, and had to be completely disassembled again before the serial numbering and the bluing process could be preformed." Further on you will see "28. ....the parts were then stamped with the rifle's Fertigungsnummmer (serial number)...Following this...the rifle ...passed on to the bluing shop". However, you are correct that there is no need to make things up.